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Finding the Fourth Proportional to 20,951.44, 28,913.40 and 11,520.88

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Solution

The fourth proportional to 20,951.44, 28,913.40 and 11,520.88 is: 15,899.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,951.44 : 28,913.40 = 11,520.88 : x
  2. Step 2: Convert to fraction form
    20,951.44/28,913.40 = 11,520.88/x
  3. Step 3: Cross multiply
    20,951.44x = 28,913.40 × 11,520.88
  4. Step 4: Simplify right side
    20,951.44x = 333,107,811.79
  5. Step 5: Solve for x
    x = 333,107,811.79/20,951.44
  6. Step 6: Final answer
    x = 15,899.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.